That the drive spindle reaches operating speed.
Spinup current is measured from the time of power-on to the time. Under nominal conditions, at 25☌ ambient temperature. see this answer to What is typical power consumption of 2.5″ Laptop external Hard Drive connected to USB socket? Typical power measurements are based on an average of drives tested, The maximum current draw is at spinup and is 1.2 A. Larger disk drives may require external power supplies, even the larger Seagate Passport drives, i.e. Important note Current draw vs current supplied Warning: If you can’t stand the heat, get out of the kitchen! 
This article is about the latter option, USB ExpressCards, principally the NanoTech brand…
Adding an ExpressCard to provide more USB ports…. Using a Firewire to USB adapter in the (unused) Firewire port ( see Is there any usb to firewire adaptor?). Another option is an actual USB hub, although I tried that (see Lexma) which was a powered hub and I ended up with a broken inaccessible partition. Also the price is about the same as two “fat” 5 TB passport drives. Also, according to this cnet review, if the drive is plugged into a USB 2.0 port then the built-in USB 3.0 hub does not work correctly, and may not detect what is connected to it. 
… one option is to use a Seagate Backup Plus hub, big (at up to 10 TB) but noisy, or at least noisier that passport external disks). Daisy chaining USB 3.0 passport disks – not possible due to them not having two USB ports (see Is there a way to daisy chain USB3 external hard drives?) and I don’t have a hub, although…. My 15″ Santa Rosa (2.4 GHz) MacBook Pro is seriously limited with its two USB 2.0 ports.
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